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# Trigonometry Definitions

Browse our growing collection of trigonometry definitions:

#### Alpha (Α, α)

Alpha (Α, α) is the first letter of the Greek alphabet. In the system of Greek Numerals, it has a value of 1.

#### Area of a Circle

The area of a circle is calculated using the formula: A = πr^{2} where r represents the circles radius.

#### Area of an Equilateral Triangle

The area of an equilateral triangle is calculated using the formula: A = ^{s2√ 3 }⁄_{4} where s represents the equilateral triangles common sid…

#### Beta (Β, β)

Beta (Β, β) is the second letter of the Greek Alphabet. In the system of Greek Numerals, it has a value of 2.

#### Gamma (Γ, γ)

Gamma (Γ, γ) is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3.

#### Greek Alphabet

The Greek alphabet has been used to write the Greek language since the late ninth or early eighth century BC. It is derived from the earlier Phoenician alphabe…

#### Omega (Ω, ω)

Omega (Ω, ω) is the 24th and last letter of the Greek alphabet. In the system of Greek numerals it has a value of 800.

#### Phi (Φ, φ)

Phi (Φ, φ) is the 21st letter of the Greek alphabet. In the system of traditional Greek numerals, phi has a value of 500 (φʹ) or 500,000 (͵φ).

#### Psi (Ψ, ψ)

Psi (Ψ, ψ) is the 23rd letter of the Greek alphabet. In the system of Greek numerals it has a numeric value of 700.

#### Terminal Side of an Angle

The terminal side of an angle θ drawn in angle standard position is the side which is not the initial side. In other terms it is the ray where measurement of a…

#### Theta (Θ, θ)

Theta (Θ, θ) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth. In the system of Greek numerals it has the value 9.

#### Triangulation

Triangulation is a process in trigonometry and geometry of determining the direction and or distance to an object or point from two or more observation points.

#### Unit Circle

The unit circle is a circle with a radius of 1 which is centered at the origin on the x-y plane.

#### Unit Circle Trig Definitions

Unit circle trig definitions are a set of definitions of the trigonometric functions sine, cosine, tangent, cosecant, secant, and cotangent all of which are de…

#### Wavelength

In physics, the wavelength is the spatial period of a periodic wave. In other terms the distance over which the wave's shape repeats.